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BISLect21-FishesOutline

BISLect21-FishesOutline - Biological Sc iences 1B Lecture...

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1 Biological Sciences 1B Lecture 21 Outline (Winter 2008) Phylum Chordata: Fishes I. Introduction: Dominant vertebrates, 21,700 described, 35,000 total A. Some characteristics: 1. Four chordate features 2. Cellular bone 3. CNS enclosed bone 4. Mostly with jaws with teeth 5. Paired pectoral, pelvic fins 6. Mesodermal scales 7. Pharyngeal slit respiratory function- gills 8. Adaptations for any aqueous habitat B. Common ancestor with lancelets C. Two basic kinds of fishes, jawless and jawed 1. Jawless Agnatha- hagfishes and lampreys, extinct Ostracoderms 2. Jawed Gnathostomes- cartilaginous and bony fishes, extinct Acanthodians D. Fishes paraphyletic without tetrapods II. Agnatha: hagfishes and lampreys A. Class Myxini : hagfishes 1. About 35 species 2. Some characteristics a. No paired appendages b. Cartilaginous skeleton c. No stomach 3. Scavengers 4. Rasping tongue
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2 5. Defense strategy- mucous 6. No predators B. Class Cephalaspidomorphi: Lampreys 1. About 40 species- vertebrate parasite 2. Unique oral disk 3. Biphasic life cycle: ammocoete larva 4. Marine and freshwater
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